[WriteLog] Help with FT-990 & WL setup

[Barry]

I never had good luck with optoisolators on my Yaesu gear.  I swapped 
then out for 2N2222 or equiv. transistors.  Simple circuit - 1Kohm 
resistor on base, emitter grounded, output from collector.
Barry W2UP

On 8 Jul 2004 at 8:38, Doug Faunt N6TQS +1-510-655-8 wrote:

>    From: dl6jz at t-online.de
>    Date: Thu, 08 Jul 2004 09:46:59 +0200 (CEST)
> 
>    Does the interface has an optocoupler for the PTT-Line. Then it
>    will not work for FT-1000MP and may be for the FT-990 also. 
> 
>    I made some experiments with my FT-1000MP with the result that the
>    voltage over the closed PTT-switch must be lower than 0.5 Volt, so
>    that the tcvr goes to transmit. And normal optocouplers has a
>    voltage of 0.7 Volt and more.
> 
> These are my thoughts also.  I've had good luck with what are sold as
> "solid-state relays'" in the Mouser catalog, which are essentially
> optocouplers with an FET output.  They have really low "on"
> resistance, and pull the keyed line very low.
> 
> 73, doug
> 
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--
Barry Kutner, W2UP              Internet: w2up at mindspring.com
Newtown, PA                     Frankford Radio Club